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README.md

nixos-servers

Nix definitions to configure our servers at home.

Acknowledgements

  • deploy-rs: NixOS deploy tool with rollback functionality
  • disko: declarative disk partitioning
  • dns.nix: A Nix DSL for defining DNS zones
  • flake-utils: Handy utilities to develop Nix flakes
  • nixos-hardware: Hardware-specific NixOS modules. Doing the heavy lifting for our Raspberry Pi
  • sops-nix: Sops secret management for Nix

Prerequisites

  1. Install the Nix package manager or NixOS (link)
  2. Enable flake and nix commands (link)

Bootstrapping

We bootstrap our servers using nixos-anywhere. This reformats the hard disk of the server and installs a fresh NixOS. Additionally, it deploys an age identity, which is later used for decrypting secrets.

⚠️ This will wipe your server completely ⚠️

  1. Make sure you can decrypt the Sops-encrypted secrets in secrets/. You can test this by running sops -d secrets/serverKeys.yaml.
  2. Ensure you have root SSH access to the server.
  3. Run nixos-anywhere: nix run '.#bootstrap' <servername> <hostname>

Deployment

To deploy all servers at once: nix run 'nixpkgs#deploy-rs' -- '.#' -k To deploy only one server: nix run 'nixpkgs#deploy-rs' -- -k --targets '.#<host>'

Known bugs

Rsync not available during bootstrap

The rsync command was removed from recent NixOS ISO which causes nixos-anywhere to fail when copying extra files. See this issue. Solution is to execute nix-env -iA nixos.rsync on the host.